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US 2003/0197589 A1Published application
Resistor and method for producing the resistor
AssigneeAlps Electric Co., Ltd.
InventorsYoshihiro Taguchi, Shunetsu Satou
Life of this patent
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AssigneeAlps Electric Co., Ltd.
InventorsYoshihiro Taguchi, Shunetsu Satou
Estimating the term…
A resistor is produced so that dispersity of carbon black in the resistor is low in a surface of the resistor and high in an inner part thereof. In the surface of the resistor, current paths are formed by the carbon black with poor dispersity to minimize a contact resistance of a sliding contact or the like. In the inner part of the resistor, the carbon black is uniformly dispersed to increase a resistance. Accordingly, a total resistance value can be prevented from lowering.
A resistor formed of a conductive resin material comprising a binder resin and a conductive filler mixed to the binder resin, wherein when compared between a surface of the resistor and an internal cross section parallel to the surface of the resistor on the basis of regions partitioned in the same area, dispersity of the conductive filler in the binder resin is lower in the surface than in the cross section.
A method for producing a resistor comprising:
Dependencies are inferred from the claim text.
From the US filing history. Foreign family members aren’t listed.
Backward citations are indexed for grants only.
Precursor compositions therefor, e.g. pastes, inks, glass frits or green body: characterised by the temporary binder
Consisting of a thick film: polymer thick film, i.e. PTF
Characterised by the permanent binder: composed of organic material
Electrical device making: resistor making
Term end not estimated
1. Field of the Invention
The present invention relates to a resistor used for a variable resistor, a switch and other electronic input devices, and it particularly has an object to provide a resistor capable of minimizing the contact resistance of the surface of the resistor with a sliding contact or contact member, and a method for producing the resistor.
2 Description of the Related Art
FIG. 1 show a resistor according to a preferred embodiment and working example of the present invention, wherein FIG. 1A is a TEM picture of the surface of the resistor, and FIG. 1B is a TEM picture of an internal cross section of the resistor;
FIGS. 2A and 2B are schematic views in the transfer of the TEM pictures of FIGS. 1A and 1B;
FIG. 3 is a TEM picture of a mixed solution comprising a binder resin and carbon black dissolved in a good solvent;
The resistor according to the present invention has a prescribed resistance value and an electronic input device using this resistor is constituted as a one in which a sliding contact or contact member makes contact with the resistor. In a device using the sliding contact, the resistance value corresponding to the position from the end part of the resistor to the sliding contact is variably set by sliding the sliding contact on the resistor formed in a rectangular pattern or ring-like pattern. In a device using the contact member, the resistor has a prescribed resistance value, and the set resistance value of the resistor is read when the contact member makes contact therewith.
FIG. 8 is a perspective view showing a linear type variable resistor as one example of an electronic input device to which a resistor as an embodiment of the present invention is applied.
The resistor 1 is formed on the surface of a substrate 2. The resistor 1 has a strip shape having a prescribed thickness and a fixed width dimension. Electrodes 3 and 4 formed of a conductive material smaller in specific resistance than the resistor 1 are conductively provided on both end parts located in the vertical (longitudinal) direction of the resistor 1. A sliding contact 5 is in contact with the surface of the resistor 1.